Are you going to piece or applique the circles? If piecing, as Holice said, you would need to draft the pattern, and add the seam allowance.
The drunkard's path I made, I did with an applique method-applique a circle onto a square (I did by machine with invisible machine applique) and then cut the block into fourths...these could be made in any size. I usually find a dish in my cupboard to use as the circle applique template.
Have fun however you decide to make it!